Disk drive employing active braking using inductive sense
US7158329B1 · kind B1 · utility
115Cited by
11References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 23, 2005 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | May 23, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. Disk control circuitry executes a spin-down operation of the spindle motor by estimating an angular position of the spindle motor by applying a voltage to at least one of the windings and evaluating a rise time of current flowing through the winding. The windings are commutated in response to the estimated angular position, and a driving current is applied to the windings to brake the spindle motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.